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Confirmed - I have followed your reproduction steps and hit the same issue. The underlying reason however is not in the python3.4 nor mod-wsgi packages. The issue is that the Docker "ubuntu:trusty" image seems to include python3.4 version 3.4.3-1ubuntu1~14.04.1 from trusty-proposed but does not (and should not) have trusty-proposed enabled in sources.list. When apt later wants to install a matching libpython3.4, it cannot find it. So this is a bug in the Docker image, which incorrectly includes packages from Ubuntu from trusty-proposed. I'll mark this Invalid against the mod-wsgi and apache2 packages in Ubuntu as there is no fix to be made in those packages. I'll add a generic Ubuntu task so we don't forget this issue until I can track down who needs to be fixing the Docker image. ** Changed in: mod-wsgi (Ubuntu) Status: New => Invalid ** Changed in: python3.4 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to python3.4 in Ubuntu. https://bugs.launchpad.net/bugs/1505164 Title: python3.4 3.4.3 prevents installation of libapache2-mod-wsgi-py3 Status in mod-wsgi package in Ubuntu: Invalid Status in python3.4 package in Ubuntu: Invalid Bug description: Steps to reproduce (using a docker container): $ docker pull ubuntu:trusty $ docker run --rm -it ubuntu:trusty /bin/bash # lsb_release -rd Description: Ubuntu 14.04.3 LTS Release: 14.04 # apt-get update # apt-get install python3.4 python3.4 is already the newest version. # python3 --version Python 3.4.3 # dpkg -l python3.4 ii python3.4 3.4.3-1ubuntu1~14.0 # apt-get install apache2 ... # apt-get install libapache2-mod-wsgi-py3 The following packages have unmet dependencies: libapache2-mod-wsgi-py3 : Depends: libpython3.4 (>= 3.4~b1) but it is not going to be installed E: Unable to correct problems, you have held broken packages. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mod-wsgi/+bug/1505164/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp